La fuerza y el movimiento (Forces and Motion)

The US president is the face of the United States to the rest of the world. However, he or she doesn’t have unlimited power within the country. The president has certain powers given by the Constitution, including the ability to make treaties, appoint some important government officials, and veto laws. Readers learn the many duties of the president in simple, clear language appropriate for both younger readers and older readers looking for a succinct review of the topic. Fact boxes supplement the main content with important details about checks and balances, amendments, and more that affect...

Kids often play with magnets, yet they don't learn how these playthings work for many years. Practical knowledge from their play can help them learn more about magnetism, and so can this book. Specially written for those with reading challenges or readers looking for a review, the main text covers important vocabulary, magnetic fields, and a discussion of why metals and magnets come together. Diagrams and succinct fact boxes offer additional ways to learn each concept and explain some ideas in greater detail.

¿Se imagina que los sueños se puedan leer?, ¿Se imagina un libro que sirva para soñar?, ¿Se imagina conocer su futuro con sólo pasar las páginas de ese libro maravilloso?, ¡Ahora puede hacerlo!, ¡No desperdicie esta ocasión de ser feliz!. Compre este libro ya. Y si no quiere usarlo, de acuerdo, no sea feliz. ¡Pero regáleselo a sus seres queridos!, ¡No sea Obtuso!, ¡No sea Tozudo!, ¡No sea Tacaño! Do you think dreams can be read? Can you imagine a book for dreaming? What about learning about your future just by studying the pages of this marvelous book? Now you can! Don't miss...

One Direction es una de las bandas más divertidas y más famosas de todo el Reino Unido. ¿Te considerás un/a verdadero/a directioner? ¡Vení a leer esta enciclopedia y enterate absolutamente todo sobre tu banda favorita de la A a la Z!

This book offers a tactile, interactive way to learn how to count to 20. Children are encouraged to trace the numbers with their fingers, find objects, and turn the wheel to reveal the correct number. It will help develop their fine motor skills as well as their powers of observation.

¿Y si el universo no pesara nada y la materia no existiera realmente? Lo que parecería ser una duda legítima para un erudito místico de los Vedas Indios es, en cambio, un resultado embarazoso de la aplicación de la Relatividad Restringida a las observaciones obtenidas por un grupo de astrofísicos, que han medido la radiación cósmica de fondo de nuestro universo. En los albores del nuevo milenio, el satélite WMAP, más allá de proporcionarnos una medida del cosmos, nunca antes obtenida, ha creado bastantes quebraderos de cabeza respecto al concepto de universo, en el que todavía hoy ...